import java.util.HashMap;
import java.util.Map;

/**
 * Created with IntelliJ IDEA.
 * Description:Map and Set
 * User: LXW
 * Date: 2022-03-05
 * Time: 19:22
 */
public class Test {
    public static void main(String[] args) {
        Map<String, String> m = new HashMap<>();
        m.put("及时雨","宋江");
       String str = m.put("黑旋风","李逵");
        System.out.println(str);

    }
}
